Astron. Astrophys. 328, 211-218 (1997)
The ALRW91 carbon stars are likely not
located in the Bulge, but are related to the SDG.
The ALRW91 carbon stars are not metal-rich.
The metallicity is about Z = 0.008 with an age
between 0.1 - 1 Gyr.
A significant number of the ALRW91 carbon stars
are located below the tip of the red giant branch.
The origin of the carbon stars one magnitude
below the red giant branch tip cannot be explained with the evolution
of a TP-AGB star.
The faint carbon stars likely originated
through mass transfer from binary evolution.
© European Southern Observatory (ESO) 1997
Online publication: March 24, 1998